US20220066133A1 - Lens device - Google Patents
Lens device Download PDFInfo
- Publication number
- US20220066133A1 US20220066133A1 US17/036,804 US202017036804A US2022066133A1 US 20220066133 A1 US20220066133 A1 US 20220066133A1 US 202017036804 A US202017036804 A US 202017036804A US 2022066133 A1 US2022066133 A1 US 2022066133A1
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- US
- United States
- Prior art keywords
- lens device
- optical group
- lens
- front optical
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
- G02B9/06—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only two + components
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0075—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. increasing, the depth of field or depth of focus
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
-
- G02F2001/294—
Definitions
- the front optical group 4 comprises three converging lenses 3 a , 3 b and 3 c , for example flat-convex lenses.
- Yet another object of the present invention is to provide a very clear and accurate image of the end and lateral surfaces of the object while simultaneously keeping the structure of the lens device simple, sturdy, and reliable.
- FIG. 1 is a perspective view of a lens device according to the invention
- the front optical group 4 has a double-convex front lens 2 .
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Lenses (AREA)
- Nonlinear Science (AREA)
- Liquid Crystal (AREA)
Abstract
Description
- This application claims priority to and benefit of Italian Patent Application No. 202020000005026 filed Sep. 2, 2020, the contents of which are incorporated by reference in their entirety.
- An object of the present invention is a lens device designed to inspect objects having at least one end surface (for example, the surface of an upper and/or lower wall) and at least one lateral surface, substantially perpendicular to the end surface. The object to be inspected has, for example, a substantially cylindrical shape.
- Another object of the present invention is to provide a lens device capable of simultaneously inspecting the end surface and the lateral surface of the objects.
- Yet another object of the present invention is to provide a very clear and accurate image of the end and lateral surfaces of the object while simultaneously keeping the structure of the lens device simple, sturdy, and reliable.
- Such objects are achieved by a lens device as described and claimed herein.
- The technical features of the present invention and advantages thereof will become more apparent from the following detailed description, made with reference to the accompanying drawings which show one or more embodiments merely given by way of non-limiting example, in which:
-
FIG. 1 is a perspective view of a lens device according to the invention; -
FIG. 2 is an optical diagram of a lens device according to the invention, in an embodiment; -
FIG. 3 is an optical diagram of a lens device according to the invention, in an alternative embodiment; -
FIG. 4 is an elevation view of an example of object to be inspected; and -
FIG. 4a shows the image provided by the lens device, of the object inFIG. 3 . - Possible exemplary embodiments of a lens device according to the present invention are indicated, as a whole, in the drawings by 100; 100′.
- In the following description, elements which are common to the different embodiments of the lens device are indicated by the same reference numerals.
- In a general embodiment, the lens device according to the present invention is designed for inspecting an
object 1 having at least oneend surface 1 a, including a front/upper or rear/lower surface, and at least onelateral surface 1 b, substantially orthogonal to the end surface. Within the context of the present disclosure, end surface of the object means a surface which is substantially perpendicular to the optical axis (X) of the lens device. - The
lens device 100; 100′ comprises alens device body 20 which develops along an optical axis (X). The lens device body (20) supports a frontoptical group 4, a rearoptical group 9, astop 5, and asensor plane 7. - The front
optical group 4 receives beams R1, R2 from theobject 1. - The rear
optical group 9 collects the beams R3 originating from the frontoptical group 4. - The
stop 5 is inserted inside the rearoptical group 9. - The
sensor plane 7 collects the beams R4 projected by the rearoptical group 9. - The front
optical group 4 is made up exclusively of refractive lenses and is formed by one or morefront lenses 2 configured to receive beams both from anend surface 1 a of the object (beams R1), which is perpendicular to the optical axis (X), and from one or morelateral surfaces 1 b of the object 1 (beams R2), which are substantially parallel to the optical axis (X), and by one or moreconverging lenses 3 arranged behind the at least onefront lens 2 and suitable to focus the beams received from the at least onefront lens 2 towards the rearoptical group 9. - The front
optical group 4 is configured so that the entrance pupil is external to the lens device. The result is that the objects the furthest from the lens device are enlarged more than those closest to the lens device. - The rear
optical group 9 allows the beams originating from various angles captured by the frontoptical group 4 to be collected and projected over the largest area possible on thesensor plane 7. - In an embodiment, the front
optical group 4 is configured so that theobject 1 to be inspected is between the entrance pupil and the frontoptical group 4. Here, the lens device is also called pericentric and allows the outer lateral surfaces of theobject 1 to be inspected. - In an alternative embodiment, the front
optical group 4 is configured so that the entrance pupil is between the object to be inspected and the frontoptical group 4. Here, reference is made to hypercentric lens and the image projected onto the sensor is the one of the inner lateral surfaces of the object. In this configuration, for example, inspecting the bottom surface of a cavity is possible. This operating mode is achieved by modifying the internal optics and/or operating distance used. - In an embodiment, the front
optical group 4 comprises threeconverging lenses - For example, two
front converging lenses lens 3 c has the convexity facing forward. - In an embodiment, the front
optical group 4 has a double-convexfront lens 2. - In an alternative embodiment, at least some of the
optical elements optical group 4 is made up of doublets for correcting the chromatic aberrations. - Certain embodiments of the lens device with various focusing methods are now described.
- The focusing procedure is performed to obtain the best results according to the object to be inspected.
- “Focusing” means having the maximum possible definition of the image projected onto the
sensor plane 7. This position is highly dependent on the size of the object and the observation distance. According to the optical and/or mechanical configuration, the following procedures can be implemented in the lens device: - Manual focusing. Here, the focusing is performed by modifying the distance of the
sensor plane 7 with respect to the whole system. Usually, spacers in the sensor assembly mechanics are inserted or removed to bring the plane closer or move it away. - Mechanical focusing. Here, the distance between the sensor and the whole optical system is carried out by means of a mechanical mechanism capable of varying the position of the rear
optical group 9 or of thestop 5 with respect to thesensor plane 7. - Focusing by means of
adaptive lens 8, as shown in the optical diagram inFIG. 3 . Anadaptive lens 8 is inserted, which is capable of modifying the shape of one of the surfaces thereof by applying an electric current. This mechanism may be controlled via software to perform focusing by means of artificial vision algorithms. The best position of the adaptive element depends on the features of thefront 4 and rear 9 optical groups. The advantage of this implementation lies in being able to vary the specifications of the lens device within certain limits without resorting to further optical or mechanical additions, and especially without performance worsening. - Therefore, in an embodiment, the lens device comprises adjustment means of the position of the
sensor plane 7 along the optical axis (X) in order to manually focus the lens device. - In an alternative embodiment, the lens device is provided with adjustment means of the position of the ocular optics 6 along the optical axis (X) in order to mechanically focus the lens device.
- In a further alternative embodiment, the lens device is provided with an
adaptive lens 8 which is electrically controllable to adjust the focusing of the lens device. - The lens device according to the present invention operates at an operating distance from the object which depends on the acceptance size of the lens device, in particular length and diameter. If the object is at the correct operating distance, the lens device projects the front and lateral surfaces thereof onto the image sensor, as shown in
FIGS. 4 and 4 a. The advantage of this lens device with respect to multi-camera systems is the possibility of using a single optics to obtain several views of the object to be controlled, making the inspection easier and less costly. Moreover, there is no need for any perspective correction required by multi-camera systems. - Therefore, there is no need for multiple cameras positioned around and above the object. The image analysis is very quick because there is no need for any image-matching software since the image acquired is continuous rather than segmented.
- There is no perspective effect which is typical of multi-camera systems.
- The objects inspected may slide easily below the lens device.
- Therefore, the invention thus conceived achieves the preset objects.
- Obviously, the practical embodiment thereof may also take on other shapes and configurations than that shown above without departing from the scope of protection as described and claimed herein.
- Moreover, all details may be replaced by technically equivalent elements, and any size, shape and material may be used according to the needs.
- This application claims priority to and benefit of Italian Patent Application No. 202020000005026 filed Sep. 2, 2020, the contents of which are incorporated by reference in their entirety.
- An object of the present invention is a lens device designed to inspect objects having at least one end surface (for example, the surface of an upper and/or lower wall) and at least one lateral surface, substantially perpendicular to the end surface. The object to be inspected has, for example, a substantially cylindrical shape.
- Another object of the present invention is to provide a lens device capable of simultaneously inspecting the end surface and the lateral surface of the objects.
- Yet another object of the present invention is to provide a very clear and accurate image of the end and lateral surfaces of the object while simultaneously keeping the structure of the lens device simple, sturdy, and reliable.
- Such objects are achieved by a lens device as described and claimed herein.
- The technical features of the present invention and advantages thereof will become more apparent from the following detailed description, made with reference to the accompanying drawings which show one or more embodiments merely given by way of non-limiting example, in which:
-
FIG. 1 is a perspective view of a lens device according to the invention; -
FIG. 2 is an optical diagram of a lens device according to the invention, in an embodiment; -
FIG. 3 is an optical diagram of a lens device according to the invention, in an alternative embodiment; -
FIG. 4 is an elevation view of an example of object to be inspected; and -
FIG. 4a shows the image provided by the lens device, of the object inFIG. 3 . - Possible exemplary embodiments of a lens device according to the present invention are indicated, as a whole, in the drawings by 100; 100′.
- In the following description, elements which are common to the different embodiments of the lens device are indicated by the same reference numerals.
- In a general embodiment, the lens device according to the present invention is designed for inspecting an
object 1 having at least oneend surface 1 a, including a front/upper or rear/lower surface, and at least onelateral surface 1 b, substantially orthogonal to the end surface. Within the context of the present disclosure, end surface of the object means a surface which is substantially perpendicular to the optical axis (X) of the lens device. - The
lens device 100; 100′ comprises alens device body 20 which develops along an optical axis (X). The lens device body (20) supports a frontoptical group 4, a rearoptical group 9, astop 5, and asensor plane 7. - The front
optical group 4 receives beams R1, R2 from theobject 1. - The rear
optical group 9 collects the beams R3 originating from the frontoptical group 4. - The
stop 5 is inserted inside the rearoptical group 9. - The
sensor plane 7 collects the beams R4 projected by the rearoptical group 9. - The front
optical group 4 is made up exclusively of refractive lenses and is formed by one or morefront lenses 2 configured to receive beams both from anend surface 1 a of the object (beams R1), which is perpendicular to the optical axis (X), and from one or morelateral surfaces 1 b of the object 1 (beams R2), which are substantially parallel to the optical axis (X), and by one or more converginglenses 3 arranged behind the at least onefront lens 2 and suitable to focus the beams received from the at least onefront lens 2 towards the rearoptical group 9. - The front
optical group 4 is configured so that the entrance pupil is external to the lens device. The result is that the objects the furthest from the lens device are enlarged more than those closest to the lens device. - The rear
optical group 9 allows the beams originating from various angles captured by the frontoptical group 4 to be collected and projected over the largest area possible on thesensor plane 7. - In an embodiment, the front
optical group 4 is configured so that theobject 1 to be inspected is between the entrance pupil and the frontoptical group 4. Here, the lens device is also called pericentric and allows the outer lateral surfaces of theobject 1 to be inspected. - In an alternative embodiment, the front
optical group 4 is configured so that the entrance pupil is between the object to be inspected and the frontoptical group 4. Here, reference is made to hypercentric lens and the image projected onto the sensor is the one of the inner lateral surfaces of the object. In this configuration, for example, inspecting the bottom surface of a cavity is possible. This operating mode is achieved by modifying the internal optics and/or operating distance used. - In an embodiment, the front
optical group 4 comprises three converginglenses - For example, two
front converging lenses lens 3 c has the convexity facing forward. - In an embodiment, the front
optical group 4 has a double-convex front lens 2. - In an alternative embodiment, at least some of the
optical elements optical group 4 is made up of doublets for correcting the chromatic aberrations. - Certain embodiments of the lens device with various focusing methods are now described.
- The focusing procedure is performed to obtain the best results according to the object to be inspected.
- “Focusing” means having the maximum possible definition of the image projected onto the
sensor plane 7. This position is highly dependent on the size of the object and the observation distance. According to the optical and/or mechanical configuration, the following procedures can be implemented in the lens device: - Manual focusing. Here, the focusing is performed by modifying the distance of the
sensor plane 7 with respect to the whole system. Usually, spacers in the sensor assembly mechanics are inserted or removed to bring the plane closer or move it away. - Mechanical focusing. Here, the distance between the sensor and the whole optical system is carried out by means of a mechanical mechanism capable of varying the position of the rear
optical group 9 or of thestop 5 with respect to thesensor plane 7. - Focusing by means of
adaptive lens 8, as shown in the optical diagram inFIG. 3 . Anadaptive lens 8 is inserted, which is capable of modifying the shape of one of the surfaces thereof by applying an electric current. This mechanism may be controlled via software to perform focusing by means of artificial vision algorithms. The best position of the adaptive element depends on the features of thefront 4 and rear 9 optical groups. The advantage of this implementation lies in being able to vary the specifications of the lens device within certain limits without resorting to further optical or mechanical additions, and especially without performance worsening. - Therefore, in an embodiment, the lens device comprises adjustment means of the position of the
sensor plane 7 along the optical axis (X) in order to manually focus the lens device. - In an alternative embodiment, the lens device is provided with adjustment means of the position of the ocular optics 6 along the optical axis (X) in order to mechanically focus the lens device.
- In a further alternative embodiment, the lens device is provided with an
adaptive lens 8 which is electrically controllable to adjust the focusing of the lens device. - The lens device according to the present invention operates at an operating distance from the object which depends on the acceptance size of the lens device, in particular length and diameter. If the object is at the correct operating distance, the lens device projects the front and lateral surfaces thereof onto the image sensor, as shown in
FIGS. 4 and 4 a. The advantage of this lens device with respect to multi-camera systems is the possibility of using a single optics to obtain several views of the object to be controlled, making the inspection easier and less costly. Moreover, there is no need for any perspective correction required by multi-camera systems. - Therefore, there is no need for multiple cameras positioned around and above the object. The image analysis is very quick because there is no need for any image-matching software since the image acquired is continuous rather than segmented.
- There is no perspective effect which is typical of multi-camera systems.
- The objects inspected may slide easily below the lens device.
- Therefore, the invention thus conceived achieves the preset objects.
- Obviously, the practical embodiment thereof may also take on other shapes and configurations than that shown above without departing from the scope of protection as described and claimed herein.
- Moreover, all details may be replaced by technically equivalent elements, and any size, shape and material may be used according to the needs.
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT202020000005026U IT202000005026U1 (en) | 2020-09-02 | 2020-09-02 | OBJECTIVE |
IT202020000005026 | 2020-09-02 |
Publications (2)
Publication Number | Publication Date |
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US20220066133A1 true US20220066133A1 (en) | 2022-03-03 |
US11726298B2 US11726298B2 (en) | 2023-08-15 |
Family
ID=76497023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/036,804 Active 2040-12-15 US11726298B2 (en) | 2020-09-02 | 2020-09-29 | Lens device |
Country Status (4)
Country | Link |
---|---|
US (1) | US11726298B2 (en) |
EP (1) | EP3968075A1 (en) |
CN (1) | CN213544395U (en) |
IT (1) | IT202000005026U1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6771433B2 (en) * | 2001-07-24 | 2004-08-03 | Ricoh Company, Ltd. | Zoom lens, variable magnification group, camera unit and portable information terminal unit |
DE102011012176A1 (en) * | 2011-02-23 | 2012-08-23 | Jos. Schneider Optische Werke Gmbh | Inspection lens for use in inspection device for optical inspection of object, comprises primary optical lens group for illuminating object, and secondary optical lens group, which is arranged on side behind primary optical lens group |
US20180324337A1 (en) * | 2015-10-28 | 2018-11-08 | Kyocera Corporation | Camera module and manufacturing method thereof |
KR20190100775A (en) * | 2018-02-21 | 2019-08-29 | 한남대학교 산학협력단 | Optical system having fixed magnification according to change of object distance and apparatus having the same |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5900057B2 (en) * | 2012-03-16 | 2016-04-06 | 株式会社ニコン | OPTICAL SYSTEM, OPTICAL DEVICE, AND OPTICAL SYSTEM MANUFACTURING METHOD |
CN104204890B (en) * | 2012-03-22 | 2016-06-15 | 富士胶片株式会社 | Imaging lens system and shooting device |
CA2938264C (en) * | 2014-01-31 | 2020-09-22 | Magic Leap, Inc. | Multi-focal display system and method |
US9602715B2 (en) | 2015-07-09 | 2017-03-21 | Mitutoyo Corporation | Adaptable operating frequency of a variable focal length lens in an adjustable magnification optical system |
EP3153848A1 (en) | 2015-10-08 | 2017-04-12 | Seidenader Maschinenbau GmbH | Optical system |
JP7292848B2 (en) * | 2018-10-16 | 2023-06-19 | キヤノン株式会社 | OPTICAL DEVICE AND IMAGING SYSTEM INCLUDING THE SAME |
-
2020
- 2020-09-02 IT IT202020000005026U patent/IT202000005026U1/en unknown
- 2020-09-29 US US17/036,804 patent/US11726298B2/en active Active
- 2020-10-12 CN CN202022260987.4U patent/CN213544395U/en active Active
-
2021
- 2021-08-24 EP EP21192834.6A patent/EP3968075A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6771433B2 (en) * | 2001-07-24 | 2004-08-03 | Ricoh Company, Ltd. | Zoom lens, variable magnification group, camera unit and portable information terminal unit |
DE102011012176A1 (en) * | 2011-02-23 | 2012-08-23 | Jos. Schneider Optische Werke Gmbh | Inspection lens for use in inspection device for optical inspection of object, comprises primary optical lens group for illuminating object, and secondary optical lens group, which is arranged on side behind primary optical lens group |
US20180324337A1 (en) * | 2015-10-28 | 2018-11-08 | Kyocera Corporation | Camera module and manufacturing method thereof |
KR20190100775A (en) * | 2018-02-21 | 2019-08-29 | 한남대학교 산학협력단 | Optical system having fixed magnification according to change of object distance and apparatus having the same |
Non-Patent Citations (3)
Title |
---|
machine translation of DE 102011012176 A1 retrieved electronically from Espacenet 6/30/2022 (Year: 2022) * |
machine translation of EP 3153848 retrieved electronically from Espacenet 6/29/2022 (Year: 2022) * |
machine translation of KR 20190100775 retrieved electronically from Espacenet January 30, 2023 (Year: 2023) * |
Also Published As
Publication number | Publication date |
---|---|
EP3968075A1 (en) | 2022-03-16 |
CN213544395U (en) | 2021-06-25 |
US11726298B2 (en) | 2023-08-15 |
IT202000005026U1 (en) | 2022-03-02 |
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